1const builtin = @import("builtin");
2const std = @import("std");
3
4const c = std.c;
5const testing = std.testing;
6
7test "strncmp" {
8 try testing.expect(c.strncmp(@ptrCast("a"), @ptrCast("b"), 1) < 0);
9 try testing.expect(c.strncmp(@ptrCast("a"), @ptrCast("c"), 1) < 0);
10 try testing.expect(c.strncmp(@ptrCast("b"), @ptrCast("a"), 1) > 0);
11 try testing.expect(c.strncmp(@ptrCast("\xff"), @ptrCast("\x02"), 1) > 0);
12}
13
14test "strdup" {
15 const org: [*:0]const u8 = "a";
16 const cpy_opt = c.strdup(@ptrCast(org));
17 const cpy = cpy_opt orelse return error.OutOfMemory;
18 defer c.free(cpy);
19
20 const cpy_u8: [*:0]u8 = @ptrCast(cpy);
21 try testing.expectEqualStrings(std.mem.span(org), std.mem.span(@as([*:0]const u8, cpy_u8)));
22 try testing.expect(@intFromPtr(cpy_u8) != @intFromPtr(org));
23
24 cpy_u8[0] = 'b';
25 try testing.expectEqualStrings("a", std.mem.span(org));
26 try testing.expectEqualStrings("b", std.mem.span(@as([*:0]const u8, cpy_u8)));
27}
28
29test "strndup" {
30 if (builtin.target.os.tag == .windows) return; // no strndup
31 const org1: [*:0]const u8 = "Hello";
32
33 const copy1_opt = c.strndup(@ptrCast(org1), 100);
34 const copy1 = copy1_opt orelse return error.OutOfMemory;
35 defer c.free(copy1);
36 const copy1_u8: [*:0]u8 = @ptrCast(copy1);
37 try testing.expectEqualStrings("Hello", std.mem.span(@as([*:0]const u8, copy1_u8)));
38
39 const org2: [*:0]const u8 = "Hello World!";
40 const copy2_opt = c.strndup(@ptrCast(org2), 5);
41 const copy2 = copy2_opt orelse return error.OutOfMemory;
42 defer c.free(copy2);
43 const copy2_u8: [*:0]u8 = @ptrCast(copy2);
44 try testing.expectEqualStrings("Hello", std.mem.span(@as([*:0]const u8, copy2_u8)));
45 try testing.expectEqual(@as(usize, 5), std.mem.len(copy2_u8));
46
47 const copy3_opt = c.strndup(@ptrCast(org1), 5);
48 const copy3 = copy3_opt orelse return error.OutOfMemory;
49 defer c.free(copy3);
50 const copy3_u8: [*:0]u8 = @ptrCast(copy3);
51 try testing.expectEqualStrings("Hello", std.mem.span(@as([*:0]const u8, copy3_u8)));
52}